I have a 9ft garage ceiling, but I am meeting with the structural engineer on Thursday to make modifications. My idea is to convert the 5 trusses above one bay to scissor type creating a vaulted ceiling effect which based on the roof pitch should give me about 2 more feet (11 total). I plan to convert the remaining trusses on the other bay to attic style which would allow me to have a loft which would overlook the bay with the vaulted ceiling. Has anyone done similar?

My plan is to then install the Pro Park 7 LL with two sets of movable jacks (the combo package). For those that have these lifts, is it safe to leave around children? Specifically, if a child has access to the garage, how easy would it be for them to intentionally raise, lower the lift? Would it be practical to make some type of power lockout device requiring a key?